What is a WO Zoom II eyepiece?
It has the typical 1.25″ WO barrel, meaning it has a tapered all black barrel, that doesn’t catch on the retaining ring of my diagonals. Why everyone hasn’t gone to this type of smooth, no hook-up design is beyond me. According to the specifications on the WO website, the Zoom II is described as follows: Focal Length 7.5-22.5mm, Lens Structure (#Elements/#Groups) 8/5, Field of View 42-66 deg, Eye Relief 18-20 mm, Weight 260g, Internally baffled, All lenses’ edges and internal spacers blackened, Fully multicoated. As far as I can tell, the specs are accurate, but I am not an optical eyepiece expert, just an average observer with about 5 years experience in the astronomy hobby. Zoom II shown between the WO 16mm UWAN and the WO 12.5mm SPL for size comparison How does it perform overall? Excellently! To sum it up, there is nothing inferior or subpar about the optical performance of this zoom eyepiece. In every test I threw at it, the eyepiece impressed me with its edge to edge sharpness, l
